メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.401080189092 44.1764072094808, 142.399467383678 44.1761467087229, 142.399744049097 44.1752848994526, 142.400105266567 44.1741255587478, 142.401698737152 44.1743868857391, 142.401381179887 44.1754244033646, 142.401080189092 44.1764072094808)) ^^http://www.opengis.net/ont/geosparql#wktLiteral